Concrete-insert.



D. W. BROOKS.

CONCRETE INSERT- APPLICATJON man JAN. 3. ma.

1 72,909. Patented July 16, 1918.

wherein,

iinrrn s'rrs r- DAVID W. BROOKS, OF NEW YORK, N. Y., ASSIGNOR T0 CONCRETE STEEL COMPANY, OF

' I NEW YORK, N. Y., A CORPORATION OF DELAWARE.

CONCRETE-INSERT.

Specification of Letters Patent.

Patented Jilly 16, 1918.

Application filed January 3, 1918. Serial No. 210,152.

what are generally" called concrete inserts.

Such devices may be embedded in the ceilingsor walls of concrete structures for the purpose of fastening hangers,'brackets' or the like. The principal objects of theinvention are to provide an insert which will possess maximum strength with the use of a inininunn amount of metal, and which may be used as a unit and assembled with others of the same type to enlarge the possibilities of useof the insert. Other objects will appear from'the following description. 1

A preferred embodiment of the invention has been selected herein for purposes of illustration and description, the same being shown in the accompanying drawing,

' Figure 1 isan end elevation of the insert,

Fig. '2 is a side elevation, r

Fig. 3 is a vertical cross-section onthe line 3-8 of Fig. 2 showing a bolt in position, r

Fig. 4: is a plan view of the underside'of the insert,

Figs. 5 and 6 are detail views later to be referred to, and

Fig. 7 is a side elevation of'two inserts set end to end. I

Referring to the drawings the insert comprises a hollow body portion 10having upwardly extending retaining cars 11 which are flared outwardly for a purpose which is adapted to rest upon the centering before the concrete is poured and the insert may be held in place by nails driven into the centering and engaging recesses 16 shown in Fig. at.

It is the usual practice to place an insert of this type upon the centering before the concrete is poured around it and to position the insert upon the centering so that it will occupy the proper position when the con- Crete-is set. It is therefore highly preferable that concrete is prevented from flowing into the interiorof the insert where it is intended later to insert the head of a bolt or the like. Previous practice with respect to inserts of this type has involved the ex tension of the body of the insert beyond a point where any strains are transmitted from the hanging bolt through the insert to the concrete, in order that the only opening may face downwardly. This entails the use of a comparatively large amount of metal which does not contribute to the strength of the insert except to a very slight extent.

The body of the insert here shown is substantially uniform in cross-section throughout its length and its ends are squared. In order to prevent the concrete from flowing into the interior of the insert end caps 17 are provided which are preferably made of thin light metal and may be easily formed by any well known stamping process. These end caps are shown to best advantage in Figs. 5 and 6. They are formed with side walls 18 which have a slight flare in order that the cap may be held in position when inserted in the end of thebody portion'of the insert as shown in Fig. 2. The end caps are provided with a flange 19 which will rest upon the centering and prevent concrete from flowing into the inside of the body. These end caps may be of any preferred shape or size the only requisite being that at least one end shall be closed by a cap which will permit the insertion of a bolt head after the insert has been set. in the concrete and the centering removed. It is preferable that both ends be closed in the same manner, both from the point of view of convenience in insertirig'the hanging bolt and as minimizing the number of parts which must be carried in stock to supply the demand of inserts for this type. The end of the caps is preferably rounded as shown at 20 in Fig. 5 in order that the amount of concrete surrounding the insert may be lessened as little as possible.

normal surface of the concrete. This may be termed a sheer line or line of cleavage. I11 order to increase the area of cleavage surface and therefore increase the hold of the insert on the concrete the ears 11 are flared outwardly'to distribute the strain between a pointwhere the pull necessary to draw the insert from the concrete is substantially equal to the pull which can be resisted by the metal of the insert itself; thus developing the full strength of the insert.

When the insert is in operative position there is a downward strain upon the bolt 21 which is resisted by the internal flanges 13 and transmitted through them to the body and ears of the insert. In the absence of any transverse connectionsbetween the sides 12 of the body portion there may be a tendency to bend the internal flanges downward. To resist this tendency the external flanges 14 are provided and it will be observed from an examination of Fig. 3 that any sagging of the flanges 13 will tend to press the flanges 1 1 against the body of concrete. It is well known that the compression strength of concrete greatly exceeds its tension strength and the flanges 14 are so formed that any downward strain upon the flanges 13 will tend to compress the concrete above the flanges 1 1. v

The requirements of building construction call for a great variety of sizes and shapes of concrete inserts. The principal variation in demand is inthe length of adjustment and the possibilities of positioning the hangingbolt 21. In other words certain constructions may require inserts having slots of varying length which are otherwise the same. The insert herein shown is admirably adapted to provide for such a situation in that it may be used as a unit to build up an insert having a long slot, that is a greater range of adjustment. As shown in Fig. 7, two of the inserts previously described may beset end to end, secured to the centering and end caps inserted only in the exposed ends of-each insert. Obviously any number of these inserts may be set up in this way to 'may be variously modified and the invention may be variously embodied within the scope of the. subjoined claims.

I claimas my invention: 7 1. An insert for concrete having a body Copies of this patent may be obtained for portion substantially uniform in cross-section'throughout its length provided with inwardly projecting hanger engaging flanges integral with said body portion, and end caps adapted to close partially the end openings of said body portion and thereby provide an entrance passage for a hanger.

2. A concrete insert having a bodyportion formed with inwardly extending hanger engaging flanges and upwardly extending concrete engaging means, said body portion, flanges and concrete engaging means being formed of heavy strain resisting metal, and caps of relatively light metal for said insert, said caps forming entrance passages. v

3. A multiple insert for concrete comprising a plurality of similar units adapted to be set end to end, each unit comprising an open ended body portion of substantially uniform cross-sectionand provided with internally projecting hanger engaging flanges abutting the flanges of an adjacent unit, and

end caps adaptedto close the open ends of the outside units while providing an entrance passage for a hanger.

4:. A concrete unit having a body portion provided with internally extending hanger engaging flanges, upwardly extending concrete engaging means, said body portion being open at one end, and an end cap adapted to close said open end except for a passageway through the plane of the base of the insert.

5. A. concrete insert having a body portion provided with internally extending hanger.

engaging flanges, upwardly extending concrete engaging means, said body portion being open in a plane substantially at right angles to the baseof the insert, and an end cap to close said opening and to provide an entrance passage from the base plane of the insert. 7

6. A concrete insert having a body portion provided with internally extending hanger engaging flanges, upwardly extending c0ncrete engaging means, said body portion'being open atone end, and a cap of resilient material adapted to be inserted in the open end of the body portion and'to frictionally engage the side walls thereof by the outward pressure upon the inner surface of said walls. In testimony whereof, Ihave signed my name to this specification this 2nd day of January, 1918.

DAVID IV. BROOKSI five cents each, by addressing the Commissioner of Patents Washington, ID. 0. v 

